1. The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 18, 2012.

2. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.69 to $20.68 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2).

3. The reporting person is one of the Managers of The Founder's Fund Management, LLC, which is the General Partner of The Founders Fund, LP ("FF"), and may be deemed to share voting and investment power over the securities held by FF. The reporting person disclaims beneficial ownership over such securities except to the extent of his pecuniary interest therein. The inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

4. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.69 to $20.70 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (4).

5. The reporting person is one of the Managing Members of The Founder's Fund II Management, LLC ("FF II Management"), which is the General Partner of The Founders Fund II, LP ("FF II"), and may be deemed to share voting and investment power over the securities held by FF II. The reporting person disclaims beneficial ownership over such securities except to the extent of his pecuniary interest therein. The inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

6. The reporting person is one of the Managing Members of FF II Management, which is the General Partner of The Founders Fund II Principals Fund, LP ("FFPF"), and may be deemed to share voting and investment power over the securities held by FFPF. The reporting person disclaims beneficial ownership over such securities except to the extent of his pecuniary interest therein. The inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

7. The reporting person is one of the Managing Members of FF II Management, which is the General Partner of The Founders Fund II Entrepreneurs Fund, LP ("FFEF"), and may be deemed to share voting and investment power over the securities held by FFEF. The reporting person disclaims beneficial ownership over such securities except to the extent of his pecuniary interest therein. The inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

8. The reporting person is the beneficial owner of Rivendell One LLC ("Rivendell"), and has sole voting and investment power over the securities held by Rivendell.

9. The reporting person is the Manager and a Member of Lembas, LLC ("Lembas"), and has sole voting and investment power over the securities held by Lembas. The reporting person disclaims beneficial ownership over such securities except to the extent of his pecuniary interest therein. The inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 or for any other purposes.

10. The shares reported on this Form 4 represent pro rata distributions, and not a purchase or sale of the shares, by Lembas, LLC to its members who are not affiliates of the issuer, without consideration.

11. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $19.02 to $20.01 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (11).

12. The reported price in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.02 to $20.07 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (12).

Remarks:

/s/ Michael Johnson as attorney-in-fact for Peter A. Thiel

08/20/2012

** Signature of Reporting Person

Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person,
see
Instruction
4
(b)(v).